Cisco Cisco ONS 15600 SDH, Руководство по устранению неисправностей

Страница: 175 / 318

2-67
Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
July 2010
Chapter 2 Alarm Troubleshooting
2.6.93 HP-DEG
Logical Object: NE-SREF
The Holdover Synchronization Mode condition is caused by loss of the primary and second timing
references in the node. Timing reference loss occurs when line coding on the timing input is different
from the configuration on the node, and it often occurs during the selection of a new node reference
clock. The condition clears when primary or second timing is reestablished. After the 24-hour holdover
period expires, timing slips could begin to occur on an ONS 15600 SDH relying on an internal clock.
Clear the HLDOVRSYNC Condition
Step 1
Clear additional alarms that relate to timing, such as:
•
2.6.82 FRNGSYNC, page 2-64
• 2.6.83 FSTSYNC, page 2-64
•
2.6.116 LOF (BITS), page 2-81
• 2.6.123 LOS (BITS), page 2-85
•
2.6.135 MANSWTOINT, page 2-91
•
2.6.136 MANSWTOPRI, page 2-92
•
2.6.137 MANSWTOSEC, page 2-92
• 2.6.138 MANSWTOTHIRD, page 2-92
•
2.6.180 SWTOPRI, page 2-113
• 2.6.181 SWTOSEC, page 2-113
•
2.6.182 SWTOTHIRD, page 2-113
•
2.6.185 SYNC-FREQ, page 2-114
•
2.6.186 SYNCPRI, page 2-115
• 2.6.187 SYNCSEC, page 2-115
•
2.6.188 SYNCTHIRD, page 2-116
Step 2 Reestablish a primary and secondary timing source according to local site practice. If none exists, refer
to the “Change Node Settings” chapter in the
Cisco ONS 15600 SDH Procedure Guide to find one.
Step 3
If the condition does not clear, log into the Technical Support Website at
http://www.cisco.com/techsupport for more information or call Cisco TAC (1 800 553-2447) in order to
report a Service-Affecting (SA) problem.
2.6.93 HP-DEG
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
Logical Object: VCMON-HP
The High-Order Path Signal Degrade condition occurs when the B3 error count in the SDH overhead
exceeds the limit.